Previous answer is
?? (Unknown Signature) (Ko-Naminohira)
(銘不明)（古波平）

Special Feature:　Naminohira is a group of swordstmiths in Satsuma that originated from Masakuni and his son Yukiyasu, who emigrated from Yamato to Satsuma in the late Heian period and continued until the late Edo period .The style is strongly characteristic of the Yamato style, but often has strong Masa and forms in Ayasugi hada.

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Appraisal Quiz #835 (February 22nd, 2025)
Who made this sword do you think ?
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Blade Length: 2 shaku 4 sun 8 bu (75.2 cm / 29.61 in).
Curvature: 6 bu (1.2 cm / 0.47 in).
Mekugi Hole: 2.
Width at Base (Motohaba): 2.74 cm (1.08 in).
Width at Tip: 1.54 cm (0.61 in).
Thickness (Kasane): 0.53 cm (0.21 in).
Shape:The tang (nakago) is unaltered (ubu).
The blade has a standard width with a slightly thin thickness.
It has a deep curvature, and the tip (kissaki) is slightly inclined forward with a compact ko-kissaki.
Jigane (Steel Surface):A fine ko-itame hada mixed with mokume hada, with ji-nie present.
Hamon (Temper Pattern):A ko-nie-based suguha mixed with small irregular patterns, featuring kin-suji (golden lines).
The tip appears somewhat hazy, and the boshi is not clearly defined.

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